Inspection And Verification
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT
acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection
Mechanical Electrical - Front End Accessory Drive (FEAD) belt
- Refrigerant
- Heater control flaps
- Ducting
- Cabin air filter
- Coolant level
- Compressor
- Cooling fan
- Fuses
- Electrical harnesses
- Harness connectors
- Blower motor
- Cooling fan
- Actuators
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.